Home host - External access ??? Please help

Can anyone help me with this one?
I'm new to the bulletin board game, but have managed to install mysql/perl/php/apache/ubb on my home Win XP box. I have ubb up and running fine no problem, but, my issue is: I want people on the internet to be able to see my board too.
I have an adsl connection to the net, and I also run a ftp server off the box via a dynamic dns client running, so people can access my server off e.g ftp://bob.dns2go.com, how can I set the same to work with my ubb??
Could they throw in http://bob.dns2go.com/public??
I've tried this but to no joy, when i put in localhost etc it works (internally) and when I put in my IP address into the browser it works (internally) but I have got a friend to try it externally to no joy.
Can anyone advise me to what I'm going to need/setup to get people to be able to view it?

Thanks for any help

Mors

Some ADSL providers block all port 80 requests, which is the default port for web traffic.

Can you try making apache listen to a different port number, and then do your address like:

http://bob.dns2go.com:82

or whatever. If this works, then your ISP is blocking port 80. If it doesn't, then you probably have some other apache configuration problem.

Do you have a firewall? Is it configured to allow incoming port 80 traffic?

Thanks for your reply!
No, port 80 isn't prohibited by my isp (BT - uk) but I do have a firewall, but I have configured this to allow port access and I've even tried it with the firewall off.
Any more idea's/places to look ??

Cheers

Mors

p.s
I'm new to apache aswell, so my httpd.conf could well be wrong, I haven't touched it at all, I've just left it as it was when I unzipped it. Seems to work internally though??